Good summary I think slightly.
Personally, when it comes to nails the real killer is washing up for me. DIY, motorbike maintenance, general housekeeping, sewing not such a problem (although I don't keep my nails long these days)
I think the gardening comparison is an interesting one.
My family weren't gardeners, but I've grown stuff and gained a similar sense of satisfaction to that which I get from a clean house, or a knitted jumper, or a shiny car (I do find washing the car therapeutic actually - on a sunny day).
I wonder if the difference is that lots of people do treat gardening as a hobby, so if they don't feel like going out and dead heading, or leaving the lawn another week, they do, they only notice they skipped a job if they look out the window.
Whereas house work - hoovering, putting the washing away seems more relentless, and less like something that you can neglect. You're in the house most of the time, you always need clothes.